Fixes based on tests

* Summary arcs are generated correctly for actual-out with multiple actions.
* Properly detect optional actions.
* Fix type insertion at incorrect level in object trees.
* Constructors may throw exceptions.
* Dynamic initializers are marked as implicit.
* The LHS of an operation assignment is included in the ExpressionObjectTreeFinder (e.g. `a += 10`).
* Admit calls from dynamic initializers.
* Removed unused utility methods.